I didn’t no

pooh

Ok I was counting the days from my last period to the nxt one and I only counted like 23 to25 day cycle bt I been thinking the whole time I had a 28 day cycle cause it’s been 5 mos and I can’t seem to conceive do that make a big difference cause I’m guessing the days I thought I was ovulating I really wasn’t but I just got off of my iud in April do birth control change ya cycle cause I was 28 day now I’m less ?